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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 模版字符串
        var s1="哈哈哈哈";
        var s2 ="呵呵呵呵";
        // var str= `<h1>${s1}</h1> <h2>${s2}</h2>`
        var str= '<h1>'+s1+'</h1> <h2>'+s2+'</h2>'

        console.log(str);

        // 字符串新增方法

        var m="8"; // 08    2022-08-16 10:03:05
        var mm= m.padStart(2,"0")
            console.log( mm )

            console.log( m.padEnd(2,"0") )

            // 10       10.00           
            // 10.0     10.00           
            // 10.01    10.01             



            console.log( "aaa.jpg.png".endsWith(".jpg") )


            var d= new Date();
            var month= (d.getMonth()+1).toString().padStart(2,0)
            console.log(month,typeof month)
    </script>
</body>
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